(n.) A colorless nonmetallic element, tasteless and odorless, comprising four fifths of the atmosphere by volume. It is chemically very inert in the free state, and as such is incapable of supporting life (hence the name azote still used by French chemists); but it forms many important compounds, as ammonia, nitric acid, the cyanides, etc, and is a constituent of all organized living tissues, animal or vegetable. Symbol N. Atomic weight 14. It was formerly regarded as a permanent noncondensible gas, but was liquefied in 1877 by Cailletet of Paris, and Pictet of Geneva.

acetylene ammonia argon asphyxiating gas butane carbon dioxide carbon monoxide castor-bean meal chlorine coal gas commercial fertilizer compost dressing dung enrichener ethane ether ethylene fertilizer fluorine formaldehyde guano helium hydrogen illuminating gas krypton lewisite manure marsh gas methane muck mustard gas natural gas neon night soil nitrate organic fertilizer oxygen ozone phosphate poison gas propane radon sewer gas superphosphate xenon